Under IEC 61439-1 and -2, an assembly design must be verified using one or more of three equivalent methods:

Now, for the critical question: where can you get the authentic PDF of the standard? A search for "iec 614391 and 2 pdf" can lead to various sources. However, it is essential to exercise caution and obtain the document from official or authorized distributors to ensure you have the correct, up‑to‑date version and are not in violation of copyright laws. As of June 2026, the most recent base editions are from 2020; however, you should verify whether any amendments or corrigenda have been issued since. Here are the official channels:

This part contains the foundational definitions, service conditions, construction requirements, technical characteristics, and verification methods applicable to all types of low-voltage switchgear assemblies. It serves as the primary reference but cannot be used alone to certify a product.

This is the organization that carries out the initial design and completes the extensive (the 12 attributes listed above). This is typically a major engineering firm or automation supplier (e.g., Schneider Electric, ABB, Siemens) that creates a specific system product line. The Assembly Manufacturer

Disclaimer: This article is for informational purposes. Always refer to the official IEC standards for legal and technical compliance. Standards are subject to updates and amendments.

The most authoritative source. You can purchase and download the PDF immediately. As of 2025, the current editions are:

Resistance to electrical interference and limitation of emitted disturbances.

Unofficial or free PDF downloads found online often contain outdated revisions, missing pages, or dangerous printing errors in formulas and technical tables. Relying on unofficial documentation introduces severe legal and safety risks to engineering projects.

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Using calculations, software simulations, or design rules to verify the design. Conclusion

Proper sizing and routing of busbars and cables.

Many reputable manufacturers (like ABB, Schneider Electric, or Siemens) offer free "Guidebooks" to IEC 61439. While these aren't the standards themselves, they provide excellent practical summaries of the PDF requirements. Conclusion

The first part of the series, , acts as the foundational document for the entire set. As a pure "general rules" standard, it does not stand alone but is referred to by every other part of the IEC 61439 series. It is designed to be paired with the product-specific requirements found in subsequent parts, such as Part 2 for power assemblies.

Having the on hand is crucial for several stakeholders:

Applying a high voltage (typically 2kV+) between live circuits and earth for 1 second to verify insulation integrity.

Specifies protection against contact with live parts, ingress of solid foreign objects, and liquids.